The binder and binding post range in complexity from simple cover and screw to heavy-weight covers with posts riveted permanently into the cover .
从简单的封面和螺丝钉到重量级的封面，而螺丝柱则是永久性，用柳钉钉入封面内。参阅活页装。
The binder and binding post range in complexity from simple cover and screw to heavy-weight covers with posts riveted permanently into the cover .
从简单的封面和螺丝钉到重量级的封面，而螺丝柱则是永久性，用柳钉钉入封面内。参阅活页装。
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